When closing a question (using Mjölnir or not), you get to know who closed it; this information is displayed in a notice below the question.

Now when the question is reopened by five people, it is not an issue not to know who reopened it. Five people are very unlikely to be wrong, especially on reopen votes (which are even more rare than close votes).

But when a user uses the dupe hammer to reopen a question without leaving any comment, how do I know who reopened it? Should I flag the post for moderator attention (seems a little overkill)?

This question was triggered by this case (post deleted, 10k+ reputation only), which is clearly abuse (I saw a lot of other examples). Thanks to the answer, I found that the guy who answered the question was the one who reopened it, without leaving any comment. (A classic. Sad, though.)

@Glorfindel this comment would fit well in your answer now that it exists.
– Jean-François Fabre♦Jan 5 '18 at 10:41

2

How did you know that only one user reopened it and not five users if you didn't know who reopened it?
– Donald DuckJan 5 '18 at 11:21

9

@DonaldDuck Perhaps the speed with which it was reopened. And I guess OP already suspected that the new answer was provided by the re-opening user - but was looking for proof.
– S.L. BarthJan 5 '18 at 11:23

@AndrasDeak yes, that's what happened. Weird right? I suppose that he knew that if he didn't delete, someone else would have. Not even needed to call SOCVR on that one! too bad for him (and the other answerer): hadn't he reopened, all this fuss would have been avoided and everyone would have kept his rep.
– Jean-François Fabre♦Jan 5 '18 at 18:26

"Five people cannot be wrong, especially on reopen votes" You must be new here
– j08691Jan 6 '18 at 22:56

everyone can be wrong, but reopening is so rare, so if 5 people agree to it, then it must be ok, that's what I meant.
– Jean-François Fabre♦Jan 6 '18 at 22:57

And yes, i'm rather new. Less than 2 years. But I'm a quick learner... and 2018 SO cannot be compared with 2008 SO.
– Jean-François Fabre♦Jan 6 '18 at 22:59